OK thanks. When I turn on Runways follow terrain the flashing no longer shows, the only downside then is there are no markings at all on the runway, taxiway and apron, also the plane sinks as much as the wheels underneath.

I've looked with Overlay Editor for Manchester but couldn't find anything. I only have a bit of time at the weekends at the moment so I'll hopefully find the problem and will report back when I do.

In the meantime thanks for converting these UK sceneries for X-plane, after moving from FSX over two years ago I certainly missed them.

I have solved the Manchester issue by not using the full apt.dat supplied. I had used that one from first use before going into XPlane otherwise the problem would have been noticed immediately. I tried by just leaving UK2000 Manchester Xtreme on it's own in the Custom scenery folder and the runways were still covered. It was then I remembered the two apt.dat files and resorted back to the original apt.dat file. I still can't see what it is reading though to show those two different textures. I also did the same with Aberdeen but did not solve that issue but not to bothered at the moment as it is only from above it flickers not on approach.

I get Earth.wed and Earth.wed.bak in the main folders and apt.dat plus fullapt.dat in the Earth nav data folder. It was the fullapt.dat that caused the issue. I used that one first (deleting the word full obviously) assuming it had all the airline gate assignments etc. I've attached below if you want to try.

Ah okay. Just check the readme's in the sceneries if you have the problem and check if you have the latest version as I fixed ground issues in an update to EGCC not long after the release. Glad you got it sorted